Discussion
Consider the following statements comparing the two organelles.
1. Both are bounded by a double membrane.
2. Both contain their own DNA and ribosomes.
3. Both generate ATP by substrate-level phosphorylation only.
Answer: D
The first two are correct and are among the reasons for thinking both descended from bacteria. The third is wrong, since each makes ATP chemiosmotically using a proton gradient. Substrate-level phosphorylation contributes only a small part of the total.
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